87ecb68bdf
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3674 c046a42c-6fe2-441c-8c8c-71466251a162
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
|
|
* QEMU NVRAM emulation for DS1225Y chip
|
|
*
|
|
* Copyright (c) 2007 Hervé Poussineau
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "hw.h"
|
|
#include "mips.h"
|
|
#include "nvram.h"
|
|
|
|
typedef enum
|
|
{
|
|
none = 0,
|
|
readmode,
|
|
writemode,
|
|
} nvram_open_mode;
|
|
|
|
struct ds1225y_t
|
|
{
|
|
target_phys_addr_t mem_base;
|
|
uint32_t capacity;
|
|
const char *filename;
|
|
QEMUFile *file;
|
|
nvram_open_mode open_mode;
|
|
};
|
|
|
|
static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
|
|
{
|
|
if (NVRAM->open_mode != mode)
|
|
{
|
|
if (NVRAM->file)
|
|
qemu_fclose(NVRAM->file);
|
|
NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
|
|
NVRAM->open_mode = mode;
|
|
}
|
|
return (NVRAM->file != NULL);
|
|
}
|
|
|
|
static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
|
|
{
|
|
ds1225y_t *NVRAM = opaque;
|
|
int64_t pos;
|
|
|
|
pos = addr - NVRAM->mem_base;
|
|
if (addr >= NVRAM->capacity)
|
|
addr -= NVRAM->capacity;
|
|
|
|
if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
|
|
return 0;
|
|
qemu_fseek(NVRAM->file, pos, SEEK_SET);
|
|
return (uint32_t)qemu_get_byte(NVRAM->file);
|
|
}
|
|
|
|
static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
|
|
{
|
|
ds1225y_t *NVRAM = opaque;
|
|
int64_t pos;
|
|
|
|
pos = addr - NVRAM->mem_base;
|
|
if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
|
|
{
|
|
qemu_fseek(NVRAM->file, pos, SEEK_SET);
|
|
qemu_put_byte(NVRAM->file, (int)value);
|
|
}
|
|
}
|
|
|
|
static CPUReadMemoryFunc *nvram_read[] = {
|
|
&nvram_readb,
|
|
NULL,
|
|
NULL,
|
|
};
|
|
|
|
static CPUWriteMemoryFunc *nvram_write[] = {
|
|
&nvram_writeb,
|
|
NULL,
|
|
NULL,
|
|
};
|
|
|
|
static CPUWriteMemoryFunc *nvram_none[] = {
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
};
|
|
|
|
/* Initialisation routine */
|
|
ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
|
|
{
|
|
ds1225y_t *s;
|
|
int mem_index1, mem_index2;
|
|
|
|
s = qemu_mallocz(sizeof(ds1225y_t));
|
|
if (!s)
|
|
return NULL;
|
|
s->mem_base = mem_base;
|
|
s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
|
|
s->filename = filename;
|
|
|
|
/* Read/write memory */
|
|
mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
|
|
cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
|
|
/* Read-only memory */
|
|
mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
|
|
cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
|
|
return s;
|
|
}
|